Fan



J. C. ARMSTRONG.

FAN.

WPHC/HON FILED FEB. 3. 1920.

v Patented Aug. l, 1922 Nawal/5.

reinas o. aniifrs'rnona or nunon, wisconsin.

FAN.A

\ Maasai.'

To all whom if may Concern Be it known that I, JAuns C. ARMSTRONG, a citizen of'the United States of america, and a resident of Beloit, county of Rock,

and Stateof Wisconsin, have invented cerd provide an improved form of fan adapted to occupy a minimum of space and having` a greater eiiiciency than fans heretofore used;- to provide such a fan of simple and i durable construction capable of manufacings, in whichtitl ture at a low cost with labor of-ordinary skill; and to provide a combined shield and draft flue in connection therewith adapted to avoid eddy current and friction losses and to accommodate the most eficient transmission of air to and from the fan.

An illustrative embodiment of this invention is shown in the accompanying draw- Fig. 1 is mainly a vertical section through the fan and related parts along the axis of the fan shaft.

Fig. 2 is mainly a frontelevation of theI sheet metal punch and easy to form. need for repairs resultingl from accident or may be applied by any of the meansy wellA known in the art for driving the fan, as for instance a pulley 3. 4

In order to properly direct and control `the flow of air, said fanv is mounted in a draft passageway .or Aflue 4 having an inlet aperture 5 in front of said fan and preferably concentric threwith, though somewhat smaller in diameter than the periphery of said fan.

On the upper part of said frame 2 is mounted a radiator 6 with which said flue 4: communicates for supplying. air thereto.

The fan proper comprisesa circular disk or back plate 7 and a peripheral series of oblong triangular blades or vanes 8 disposed radially on the front side thereof with their wide ends disposed outward.

l Specification of Letters lPatent` application led Tlebrnary 3, 1.320t` derlei No.

Patented slug. 1, 1922.

atenas.

Each of said vanos is provided with a flange 9 on its radially disposed back edge so formed and positioned as tohold the main body of the vane substantially perpendicular tothe plate 7 Said Hanges are secured Jby means 10Ato the back plate, rivets being well adapted Vfor this` purpose.

1n order to provide for convenient attachment of the backfplate 7 to the shaft 3, a hub 11 is provided adapted to receive the end of 'said shaft in snug fitting relation and providedwith a flange 12 which is secured to said' back plate by means 13, rivets also being well adapted for this use. A fastening 14, for example a pintle, is provided to secure the hub in place onfthe shaft.

The. ue wall 15 is so formed adjacent to the fan as to provide relatively small clearance space at the lower edge of the fan, as

Y at 16, and with gradually increasing clearance upward and at the sides of said fan, as at 17. The upper part 18 of the lue is amply wide to accommodate the necessary ow of air and at the top is turned back, as at 19, to discharge air into the radiator 6, The flue wall or 'casing -is secured to the frame or base 2 by means-ofbrackets 20, as shown in Fig. 2.

It is apparent that this fan is of such simple construction that, Awith the exception of the hub, it may be madevreadily -froin ings of'- simple Acharacter furthermore, in case of lvantage of these fans'has been demonstrated by extensive use and their etficiency has been proven -by carefully conducted tests carried out under my` observation and direction.

Although but one Specific embodiment ot this invention has been herein shown and described, it will be understood that numerous details ot the construction shown may row ends pointing' inwardly.l

2. A low pressure, centrifugal fan adaptf ed for large capacity and having right triangular vanes formed relatively wide at their outer ends and diminishing toward their inner ends in combination with a guide flue having substantially a full lfan sized open front for the ladmission of a fluid AInethe fan, said flue bein dium directly to the diagonal edge side of formed and disposed to discharge said me ium edgewise of'said fan. f

3. A fan, comprising in combination an axially imperforate disk, a hub secured cod axially to the middle-part of said disk, a.

driving .shaft secured'to saidhub, and .a plurality of triangular vanes disposed radially orfk one of theA faces .of ,said disk, said hub having abore toreoeive an end of said shaft and including a radialftlagge at one end to which said -disk is fastene 4. A large-capacity, high-speed, low-press ysure Ventilating fan of small size comprising a housing, infc'ombination with a' centrifugalpaddle wheel of narrow shape havingtriangular blades disposed radially and pointing toward the fan axis, said housing including arim part and a pair of plates spaced suilioiently to clear fsaid wheel,0ne of said plates having an axial inlet aperture'nearly equal tothe size of said wheel and said rimpart having a discharge aperture corresponding substantially therewith in effective size.

Signed at--Chicago this 24 day oi Jan.

JAMES c. ARMSTRONG. 

